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This part is actually called the fresh air door vent and if you are putting vacuum on it and the door is opening, then you have a problem somewhere else. Probably a vacuum hose loose or a defective vacuum select switch in the heater control.
Thank you. The majority of the interior is apart, I figured since it was apart I should check the 2 vacuum valves. How do I check them? The other one is located along the firewall. I purchased the car with the majority of the interior disassembled and of course nothing was labeled.